Structure-activity relationship study reveals ML240 and ML241 as potent and selective inhibitors of p97 ATPase.

ABSTRACT: To discover more potent p97 inhibitors, we carried out a structure-activity relationship study of the quinazoline scaffold previously identified from our HTS campaigns. Two improved inhibitors, ML240 and ML241, inhibit p97 ATPase with IC(50) values of 100 nM. Both compounds inhibited degradation of a p97-dependent but not a p97-independent proteasome substrate in a dual-reporter cell line. They also impaired the endoplasmic-reticulum-associated degradation (ERAD) pathway. Unexpectedly, ML240 potently stimulated accumulation of LC3-II within minutes, inhibited cancer cell growth, and rapidly mobilized the executioner caspases 3 and 7, whereas ML241 did not. The behavior of ML240 suggests that disruption of the protein homeostasis function of p97 leads to more rapid activation of apoptosis t

SUBMITTER: Chou TF 

PROVIDER: S-EPMC3662613 | biostudies-literature | 2013 Feb

REPOSITORIES: biostudies-literature